== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:03:02 (1718928182)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.649336 s, 161 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 5.05028
Iter 1/10: OSS cache speed: 6.46862
Iter 1/10: ladvise speed: 6.59709
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.76903
Iter 2/10: OSS cache speed: 6.6275
Iter 2/10: ladvise speed: 6.68763
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.34329
Iter 3/10: OSS cache speed: 5.96366
Iter 3/10: ladvise speed: 6.0899
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.54713
Iter 4/10: OSS cache speed: 6.4477
Iter 4/10: ladvise speed: 5.23198
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.37914
Iter 5/10: OSS cache speed: 6.50355
Iter 5/10: ladvise speed: 6.3981
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.36044
Iter 6/10: OSS cache speed: 6.26925
Iter 6/10: ladvise speed: 5.77002
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.68719
Iter 7/10: OSS cache speed: 4.51141
Iter 7/10: ladvise speed: 5.49018
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.42294
Iter 8/10: OSS cache speed: 4.53685
Iter 8/10: ladvise speed: 4.60035
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.92956
Iter 9/10: OSS cache speed: 4.66726
Iter 9/10: ladvise speed: 6.26897
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.5994
Iter 10/10: OSS cache speed: 6.31447
Iter 10/10: ladvise speed: 5.85817
Average uncached read: 4.80
Average speedup with OSS cached read:  5.83 = +21.45%
Average speedup with ladvise willread:  5.89 = +22.70%
Speedup with OSS cached read less than 20%,  got 5.83%. Skipping ladvise willread check.